On 27.4.2011 01:31, Joe Landman wrote: > ... Also, understand that ext* suffers badly under intense parallel > loads. Keep that in mind as you make your file system choice. What sort of suffering can I expect? Is it relevant to high performance RAID[56] systems only or also for a single hard drive test cases? I made a quick local writing test with fio and a 1TB SATA disk and could not see any problem. The configuration was identical for both ext4 and xfs filesystems: Ext4 filesystem: [ext4w] rw=write size=4g directory=/mnt/export iodepth=16 direct=0 blocksize=512k numjobs=8 ioengine=vsync create_on_open=1 WRITE: io=32708MB, aggrb=100023KB/s, minb=102424KB/s, maxb=102424KB/s, mint=334850msec, maxt=334850msec Disk stats (read/write): sdb: ios=11/63707, merge=0/7971550, ticks=2347/46130116, in_queue=46203840, util=99.82% XFS filesystem: [xfsw] . . all the same . WRITE: io=32708MB, aggrb=88095KB/s, minb=90209KB/s, maxb=90209KB/s, mint=380191msec, maxt=380191msec Disk stats (read/write): sdb: ios=12/71594, merge=0/2191, ticks=2326/54558130, in_queue=54641400, util=99.92% With on-disk write-caching = 0 (off): ext4: WRITE: io=32708MB, aggrb=34179KB/s, minb=35000KB/s, maxb=35000KB/s, mint=979907msec, maxt=979907msec Disk stats (read/write): sdb: ios=20/164893, merge=0/16622549, ticks=1953/64535056, in_queue=64536990, util=97.41% xfs: WRITE: io=32708MB, aggrb=42452KB/s, minb=43471KB/s, maxb=43471KB/s, mint=788954msec, maxt=788954msec Disk stats (read/write): sdb: ios=4/71372, merge=0/2292, ticks=1236/114143050, in_queue=114306843, util=99.89% Is the load sufficient? The system has 8GB of memory. Thanks for any response. Jan
